Novel organophosphorus schiff base ligands: Synthesis, characterization, ligational aspects, XRTD and biological activity studies

Six complexes have been synthesized from Cu(II), Ni(II), and Co(II) with new bidentate N₂ donor Schiff base ligand (2-methoxybenzalidene-1-phenylsemicarbazide L₁) and tridentate N₂O donor organophosphorus Schiff base ligand (2-methoxybenzalidenediphenylphosphate-1-phenylsemicarbazide L₂). Both ligands were synthesized and characterized by metal analysis, infrared (IR), ultraviolet visible (UV-Vis), and nuclear magnetic resonance (NMR) spectral studies. The chemical structures of the synthesized complexes were characterized using their metal analysis, magnetic susceptibility, molar conductance, IR, and UV-Vis spectra. According to molar ratio studies, the complexes have the composition of ML₂ for L₁and ML for L₂. The X-ray diffraction (XRD) studies showed that the particle size of ligands and L₁ complexes were in nano-range. The ligands and their metal complexes have been screened for their antioxidant, antibacterial and antifungal activity. (author)